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Finding the Fourth Proportional to 205.98, 308.76 and 90.48

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Solution

The fourth proportional to 205.98, 308.76 and 90.48 is: 135.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.98 : 308.76 = 90.48 : x
  2. Step 2: Convert to fraction form
    205.98/308.76 = 90.48/x
  3. Step 3: Cross multiply
    205.98x = 308.76 × 90.48
  4. Step 4: Simplify right side
    205.98x = 27,937.93
  5. Step 5: Solve for x
    x = 27,937.93/205.98
  6. Step 6: Final answer
    x = 135.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.